ruby 2.5 is not supported and 2.7 is very close to not supported.

[choffee]

The sample ruby app should be updated to a supported version of ruby.

[micheal000010000-hub]

Hi 👋, I’ve opened a pull request that updates both blank-ruby and layer-ruby sample apps to Ruby 3.2 (supported version).

• Gemfiles updated with ruby '3.2'
• No functional code changes
• CI will handle dependency installation and testing

PR: #486